> Unless I'm mistaken, I feel like I'm trying to do what's described in the HowTo
> guide under "Jittered ISI and Randomized stimulus presentation".
Yes, the program does jitter ISI other than stimulus sequence in the sense that ISI's are randomly assigned across the design, but if you want to specifically pick up ISI's among 2, 4, and 6 seconds and not any other time spans, then RSFgen can't do that. In other words, ISI could be any number of TR's, only constrained by the total time allowed.
Gang